1.First you need to have FREE account in the respective filehosting website
2. Then Install 'Cookies Manager' firefox addon.
3. Restart firefox.
4. Now, go to Tools>>Cookies Manager.
5. Search for respective account in the Cookies Manager search dialog box.
6. Make the following change depending on your cookie host :
Websites Check for these in the editor
Filesonic.com.....................PHPSESSID
Wupload.com.................PHPSESSID
Fileserve.com.....................PHPSESSID
Megaupload.com................ user
Hotfile.com........................auth
Rapidshare.com....................enc
Netload.in........................cookie _user
Depositfiles.com..................autolo gin
Oron.com..........................xfss
Alldebrid........................................uid
7.Then edit the above value and replace the content with premium cookie UPDATED.and save it then refresh the page and download file.